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Daca x/y=3/5 determinati 5x-y/x+3y

Răspuns :

x/y=3/5  => x = 3y/5

5x-y/x+3y = [5(3y/5) -y] / (3y/5)+⁵⁾3y = 3y-y / (3y+15y)/5 <=>

2y*5 /18y =10y/18y = 10/18 = 5/9